Refrigerant Circuit Part; Refrigerant Circuit (Piping Diagrams); Outdoor Unit - Daikin VRV X RXQ6-48ANR Series Service Manual

SiME341909EA

1. Refrigerant Circuit (Piping Diagrams)

1.1

Outdoor Unit

1.1.1 RXQ6/8/10/12AR
No. in
Electric
piping
symbol
diagram
(1) M1C Compressor
(2) M1F Inverter fan
Inverter fan
(3) M2F
(RXQ10/12AR only)
Electronic expansion valve
(4) Y2E
(Injection)
Electronic expansion valve
(5) Y4E
(Refrigerant auto charge)
Solenoid valve
(6) Y3S
(Oil return 1)
(7) S1NPH High pressure sensor
(8) S1NPL Low pressure sensor
High pressure switch
(9) S1PH (For M1C compressor)
Pressure regulating valve
(10) —
Double tube heat exchanger
(11) —
(Subcooling heat exchanger)
Capillary tube
(12) —
Thermistor
(13) R1T
(Outdoor air: Ta)
Thermistor
(14) R21T
(Discharge pipe: Tdi1)
Thermistor
(15) R3T
(Suction pipe: Ts)
Thermistor
(16) R4T (Heat exchanger liquid pipe: Tf)
Thermistor
(17) R5T (Subcooling heat exchanger
liquid pipe: Tsc)
Thermistor
(18) R6T (Subcooling heat exchanger
gas pipe: Tsh)
Thermistor
(19) R8T
(Compressor body: Ti1)
Part 2 Refrigerant Circuit
Name
Compressor is operated in multi-steps according to Te.
The fan rotation speed is varied by using inverter.
PI control is applied to keep the outlet superheating degree of subcooling
heat exchanger constant.
Used to control refrigerant charging speed during refrigerant auto charge
operation and to stop refrigerant charge automatically.
Used to control the amount of oil from the oil separator to the compressor.
Used to detect high pressure.
Used to detect low pressure.
In order to prevent the increase of high pressure when an error occurs, this
switch is activated at high pressure of 4.0 MPa or more to stop the
compressor operation.
This valve opens at a pressure of 4.0 MPa for prevention of pressure
increase, thus resulting in no damage of functional parts due to the increase
of pressure in transportation or storage.
Used to subcool liquid refrigerant.
Used to return the refrigerating oil separated through the oil separator to the
compressor.
Used to detect outdoor air temperature, correct discharge pipe temperature,
and others.
Used to detect discharge pipe temperature, make the temperature
protection control of compressor, and others.
Used to detect suction pipe temperature, and for other purposes.
This detects temperature of liquid pipe between the air heat exchanger and
check valve. Used to make judgments on the recover or discharge
refrigerants to the refrigerant regulator.
This detects temperature of liquid pipe between the double tube heat
exchanger.
This detects temperature of gas pipe on the evaporation side of subcooling
heat exchanger. Used to exercise the constant control of superheating
degree at the outlet of subcooling heat exchanger.
Detects compressor surface temperature, this switch is activated at surface
temperature of 120°C or more to stop the compressor operation.
Refrigerant Circuit (Piping Diagrams)
Function
19